SU761784A1 - Fire box - Google Patents

Description

The invention relates to the design of devices for burning fuel with simultaneous heating of the gas and can be used in steam and gas turbine installations. five

Known combustion devices contain a vertical power case in which heat-exchange tubular screens are placed with a gap relative to the walls, forming a prismatic combustion chamber, the lower part of which is equipped with burners [1].

The disadvantage of these devices is that when used in steam-gas installations they do not provide heating of 15 high-pressure gases coming from the steam generator.

Also known are flue devices containing a vertical power case, 20 in which heat exchange tubular screens are placed with a gap relative to its walls, forming a prismatic combustion chamber, the lower part of which is equipped with burners, and the upper part is made with a gap between the pipes and installed in the gas supply duct connected to the combustion chamber [2].

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The disadvantage of these devices is the increased hydraulic resistance of the path of heated gases due to the small section for their passage from the gas duct into the combustion chamber, limited by the distance between the pipes.

The aim of the invention is to increase the efficiency of operation of the combustion device by reducing the hydraulic resistance.

This is achieved by the fact that the combustion chamber in cross section has the shape of a rectangle, its two opposite screens in the area of the gas supply duct are concave into the cavity of the combustion chamber with vertical displacement of opposite concave sections, and the pipes of the latter are separated vertically to form a spatial lattice.

FIG. 1 shows the combustion device, a longitudinal section; in fig. 2 - section A — A of FIG. one.

The furnace device contains a vertical power body 1, in which a heat gap tubular screens 2-4 are placed with a gap and relative to its walls, forming a prismatic combustion chamber 5, the lower part of which is equipped

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burners 6, and the top is installed in the gas supply box 7.

The combustion chamber 5 in cross section is rectangular in shape, its two opposite screens 2 and 3 in the gas supply duct zone are concave into the cavity of the combustion chamber 5 with vertical displacement, and the tubes of screens 2 and 3 are diluted vertically with the formation of spatial grids 8, by means of which the gas supply the box 7 is in communication with the combustion chamber 5. The housing 1 and the box 7 are equipped with nozzles 9 and 10 for the supply, respectively, of water and gas.

The combustion device operates as follows.

The air through the pipe 9 is sent to the power housing 1, passes through the annular gap a, providing cooling of the walls of the housing 1, and through the burner 6 together with the fuel enters the combustion chamber 5, where it burns. The resulting flue gases are mixed in the upper part of the combustion chamber 5 with high-pressure gases entering the duct 7 but the nozzle 10, they are heated to a predetermined temperature, and the resulting gas mixture is sent to the combined-cycle plant.

The mixing of gases occurs in spatial lattices 8, which ensures their good mixing, which is necessary for the good operation of the gas turbine.

In addition, the connection of the gas box 7 to the combustion chamber through spatial lattices 8, spaced apart by the height of the combustion chamber 5, allows for the necessary flow area for high-pressure gases, which reduces the hydraulic resistance and, therefore, increases the efficiency of the installation.

Claims (2)

Claim A furnace device containing a vertical power housing, in which heat exchange tubular screens are placed with a gap relative to its walls, forming a prismatic combustion chamber, the lower part of which is equipped with burners, and the upper one is installed in a gas supply duct connected to the combustion chamber, characterized in that increase efficiency by reducing the hydraulic resistance, the combustion chamber in cross section has the shape of a rectangle, two of its opposite screen in the area of the gas supply box in bent into the cavity of the combustion chamber with vertical displacement of the opposite concave sections, and the pipes of the latter are dispersed vertically with the formation of a spatial lattice. Sources of Information taken into account in the examination 10 1. USSR author's certificate No. 346547, cl. R 22B 31/04, 1970. 2. Technical design of TsK.TI-TKZ steam generator high-pressure twin-unit VPG-600 for PGU-250, Lenin15 deg - Taganrog, 1976. Outgoing gases